Better yet, run a bunch of political ads where self-described "lifelong Democrats" claim they will NOT be voting for Biden in 2020 ("I've voted Democrat in every election since I was 18, but when they nominate someone for President who's not even mentally sound enough to serve, well then, I just gotta do what's right and prevent such a person from ever becoming Commander-in-Chief")
Call it "The FDR Project" ... "This ad paid for by The Franklin Roosevelt Project"
Gotta fight fire with fire.